Valve



July 28, 1942. L. c. ROTTER E-rAl. 2,291,563

VALVE Filed May 12, 1941 2 Sheets-Sheet 2 Patented July 28, 1942 VALVE Lutwln C, Rotter, Maplewood, and Victor G.

Klein, St. Louis, Mo., assignors to Lincoln Engineering Company, St. Louis, Mo., a corporation of Missouri Application May 12, 1941, seran No. 393,050

i 7 claims. (Cl. 251-14) 'Ihis invention relates to valves, and with regardrto certain more specific features, to shut-off valves.

Among the several objects of the invention may be noted the provision of a shut-off valve which may be operated by simple reciprocation; the provision of a valve of the class described in which sealing such as is obtained in a slide valve is obtained without requirement of a lapped or similar t; and the provision of a valve of the class described which is easy, simple and reliable in operation and in which the chief wearing part is readily renewable. Other objects Will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the ele- .ments and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structures hereinafter described, and the scope of the application of which will beindicated in the following claims.

In the accompanying drawings in which are shown two of various possible embodiments of the invention,

Fig. 1 is a longitudinal section of one form of the valve shown in air-transmitting position;

Fig. 2 is a view similar to Fig. l, but showing the valve in release position;

Fig. 3 is a horizontal section taken on line 3-3 of Fig. 1;

Fig. 4 is a left-side elevation of the valve stem of Figs. 1 and 2, removed for clarity;

An air control valve performing functions of I the general type that the valve herein performs is shown in the United States patent application of Frank S. Barks et al., Serial No. 334,422, led May 10, 1940, for Reel. Heretofore, valves of this type have been either of the poppet type, such as shown in Fig. 4 of said application, or of the lapped slide valve type, such as shown in Fig. 8. Poppet valves have the disadvantage that foreign material may easily become lodged upon their seats causing leakage, and slide valves have the through the 'packing washer I9 is sealed by ing fit, or packed b y excessively complicated peripheral means. The present valve avoids these and other disadvantages.

Referring now more particularly to Fig. 1, there is shown at numeral I a valve body which is cylindrically bored as indicated at 3. In the bore 3 is a sliding cylindric valve stem 5. 'I'he t between the body I and the valve stem 5 needs not to be very close, that is, it needs not to be lapped as heretofore. 'I'hus the stem 5 slides freely in zfthe body l.

Threaded in laterally from the side of body I is a nipple 1, the outlet 9 of which is coupled to an outlet pipe II. This nipple is hollow, or cupshaped on the inside, as indicated at I3, for the reception of a coil spring I5. Spring I5 reacts against one end of the hollow, cup-shaped portion I3 and pushes -at the opposite end against a metal pressure washer Il. In front of, and pushed by, the washer Il is a sealing gasket I9, preferably composed of synthetic rubber or the like which will resist attack of oil and other substances which occur in air lines.

The cupped part' of nipple l extends inward as indicated at 2l, flush with a longitudinal depressed-facing 25 cut into the stem 5. This cupshaped extension 2| holds the packing washer I9 and also prevents the stem 5 from turning. It also permits reciprocation of the valve. The spring I5 biases the packing washer I9 from the cup and against the surface 23 to effect a seal. It also seals radially in the cup under inside and end w1se pressure.

Interiorly the valve stem 5 is provided with a central passage 2l which conveys air from a flexible pipe 29 connected at 3|. 'Ihe hollow portion 2l has an outlet '33, which, in the position of the valve shown in Fig. 1, transmits air through the packing Washer I9 and hence to the pipe I I. When the valve is pushed down, as indicated in Fig. 2, its outlet 33 moves out of alignment with the packing I9 and over the edge of cup 2|. 'I'his permits exhaust of air through the space left by flat 25 and a slot 24. The hole the flat 25. y

The' flat 25 communicates with the exterior of the valve through a groove 24. It is to be seen that the cup extension 2l adjacent to the flat 23 is engaged by the portions adjacent the at 23 to form limiting stops. 'I'his provides a simple my of forming stops for limiting the valve hmo- The valve is controlled from a member 35 disadvantage that they must be lapped for a sealwhich is connected at 3l.

vided with a cylindric bore 43 for a valve stem 4I. This stem has two reduced double i'lat portions 41 and 49. `At all other points `the stem is cylindric and has va sliding but non-sealed iit with respect to the body 4|. The reduced double flats 41 and 49 are made by milling opposed parallel faces, which provides for insertion of extensions 2I of oppositely paired nipples 1, which carry the valve packing parts corresponding to the parts already described. Similar reference characters indicate this.

The upper ilats 41 communicate with the atmosphere through an axial slot Il and the lower iiats 49 communicate with the atmosphere through an axial slot B3.

A port 5I passes between the upper ilats 41 and on one fiat 41 is a slot I1.

A port` I9 also passes .between the lower ilats 49 and there is also a slot Il on one iiat 49. A central circular groove 83 cooperates with a biased detent ball 8l normally to hold the parts midway between the positions shown in Figs. 5 and 6. This is the non-transmitting position.

Operation of the alternative embodiment is as follows:

When the valve stem 4l is pulled up at handle Il, a lower outlet O1 is placed in communition with a lower inlet B9 through the cross port B9 which aligns with the opposite lower washers I9. At this time, an upper outlet 1| is out oi! from an upper inlet 13, and is placed in communication with the atmosphere through the slot i1, reduce'cl portion 41, and the groove Il (see also Fig.

When the parts are in the position shown in Fig. 6, the upper outlet 1| and the upper inlet 13 are in communication; whereas the lower outlet 61 is out of communication with the lower inlet O9 and is in communication with the atmosphere through the groove 6|, reduced portion 48, and groove 5L A diilerence between the form of the invention shown in Figs. 1-3 and that shown in Figs. 5-8 is that in the former case the feed for, the valve is through the valve stem, requiring a flexible inlet pipe 29; whereas in the latter case the feed for each valve is through the valve body. In the case of Figs. 5-8, the valve stem is substantially completely balanced, so far as static pressures are concerned.

The extensions 2i into the reduced portions oi the valve stem serve to be engaged by the adjacent portions oi the valve stem to act as Hunting stops, as indicated. Thus, the ends of the depressions formed by the ilats 2i may be reierred .to as stops Il which limit motion of either form of the valve upon engagement with one ot the cup-shaped portions 2l.

several objects of the invention are achieved and other advantageous results attained.

Asmanychangescouldbemadeintheabove constructions without departing from the scope o! the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Weclaim:

1. A-slide valve comprising a'hollow cylindric body, a cylindric valve stem loosely sliding therein. said valve stem having a depressed ilat portion limited in axial length to form endwise stops. outlet means associated with the body portion and having an open cup-shaped portion directed toward said flat portion and engageable by said stops, a packing washer in the open end oi said cup-shaped portion, spring means in said cupshaped portion and behind the packing washer biasing it toward said iiat portion, said valve stem having a huid-transmitting opening movable into and out of alignment with respect to said washer when the valve is moved the limited amount permitted by engagement oi the stops with said cup-shaped extension.

2. A slide valve comprising a hollow cylindri body, a cylindric valve stem loosely sliding therein, said valve stem having a depressed at portion limited in axial length to form endwise stops, outlet means associated with the body portion and having an open cup-shaped portion directed 'toward said iiat portion and engageable by said stops, a packing washer in the open end of said cup-shaped portion, spring means in said cupshaped portion and behind the packing washer biasing it toward said ilat portion, said valve stem having a huid-transmitting opening movable into and out of alignment with respect to said washer when the valve is moved the limited amount permitted by engagement oi the stops with said cupshaped extension, and an axial release passage in the stem from the depressed at portion to atmosphere for releasing fluid when said opening in the stem is out of alignment with the washer.

3. A slide valve comprising a hollow cylindric body, a cylindric valve stem loosely sliding therein, opposite flat portions on said valve stem limited.in axial length, opposite cup-shaped means associated with the body portion and having their open ends directed toward said ilat portions, packing washers in the ends oi said cupshaped portions, spring means in said cup-shaped portions and behind the packing washers and biasing them toward one another and toward said fiat portions, said valve stem having a iluidtransmitting opening movable into and out of alignment with respect to said washers when the valve is moved the limited amount permitted by said cup-shaped extension.

4. A slide valve comprising a hollow cylindric body, a cylindric valve stem loosely sliding therein, opposite nat portions on said valve stem limited in axial length, opposite cup-shaped means associated with the body portion and having their open ends directed toward said at portions, packing washers in the ends of said cup-shaped portions, spring means in said cup-shaped portions and behind the packing washers and biasing them toward one another and toward said nat portions, said valve stem having a fluid-transmitting opening movable into and out of alignment with respect to said washers when the valve is moved the limited amount permitted by said cup- In view of the above, it will be seen that the 7s shaped extension, one flat having a relief portion and movable into alignment with one washer when said opening is out of alignment.

5. A valve comprising a cylindric body portion, a cylindric valve stem iitting loosely and sliding therein, said stem being hollow and 'forming a iluid inlet, said stem also havingv a attened portion and a communication with the flattened portion from the hollow portion, the ends of the ilat portion forming limiting stops, a nipple intersecting said body portion and forming a cup extending therein to cooperate with said flat portion, packing means in the end of the cup, a spring in the cup biasing the. packing means against the at portion, said body portion having an axial communication between the fiat portion and the exterior for release means.

6. A valve comprising a cylindric body `por -tion, a cylindric valve stem loosely tting and sliding in said body portion, said stem having a reduced portion forming two oppositely located flats, a cross connection for fluid at one end of said ats and a release connection at the other end and on one side, said body portion `also having an outlet from the fiat side corresponding tosaid connections, coaxial cup-shaped members directedv toward one another and extending into said body portion and having ends adjacent said body, a cylindric valve stem sliding therein, said valve stem having a depressed flat portion limited in axial length to form endwise stops, fluidtransmitting means associated with thezbody portion and having an open cup-shaped portion directed toward said ilat portion and engageablel by said stops, and fluid-transmitting packing means in the openend of said cup-shaped portion including resilient means for biasing the same toward said fiat portion, said valve stem having a fluid-transmitting opening movable into and out of alignment with respect to said washer when 'the valve is moved the limited amount permitted by the engagement of the stops with said cupshaped extension.

LUTWIN C. ROTTER. VICTOR G. KLEIN. 

